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  <div class="section" id="xml-rpc-and-xml-rpc-server-classes">
<h1>XML-RPC and XML-RPC Server Classes<a class="headerlink" href="#xml-rpc-and-xml-rpc-server-classes" title="Permalink to this headline">¶</a></h1>
<p>CodeIgniter&#8217;s XML-RPC classes permit you to send requests to another
server, or set up your own XML-RPC server to receive requests.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#what-is-xml-rpc" id="id3">What is XML-RPC?</a></li>
<li><a class="reference internal" href="#using-the-xml-rpc-class" id="id4">Using the XML-RPC Class</a><ul>
<li><a class="reference internal" href="#initializing-the-class" id="id5">Initializing the Class</a></li>
<li><a class="reference internal" href="#sending-xml-rpc-requests" id="id6">Sending XML-RPC Requests</a><ul>
<li><a class="reference internal" href="#explanation" id="id7">Explanation</a></li>
</ul>
</li>
<li><a class="reference internal" href="#anatomy-of-a-request" id="id8">Anatomy of a Request</a></li>
<li><a class="reference internal" href="#creating-an-xml-rpc-server" id="id9">Creating an XML-RPC Server</a></li>
<li><a class="reference internal" href="#processing-server-requests" id="id10">Processing Server Requests</a><ul>
<li><a class="reference internal" href="#notes" id="id11">Notes:</a></li>
</ul>
</li>
<li><a class="reference internal" href="#formatting-a-response" id="id12">Formatting a Response</a></li>
<li><a class="reference internal" href="#sending-an-error-response" id="id13">Sending an Error Response</a></li>
<li><a class="reference internal" href="#creating-your-own-client-and-server" id="id14">Creating Your Own Client and Server</a><ul>
<li><a class="reference internal" href="#the-client" id="id15">The Client</a></li>
<li><a class="reference internal" href="#the-server" id="id16">The Server</a></li>
<li><a class="reference internal" href="#try-it" id="id17">Try it!</a></li>
</ul>
</li>
<li><a class="reference internal" href="#using-associative-arrays-in-a-request-parameter" id="id18">Using Associative Arrays In a Request Parameter</a></li>
<li><a class="reference internal" href="#id2" id="id19">Data Types</a></li>
</ul>
</li>
<li><a class="reference internal" href="#class-reference" id="id20">Class Reference</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="what-is-xml-rpc">
<h2><a class="toc-backref" href="#id3">What is XML-RPC?</a><a class="headerlink" href="#what-is-xml-rpc" title="Permalink to this headline">¶</a></h2>
<p>Quite simply it is a way for two computers to communicate over the
internet using XML. One computer, which we will call the client, sends
an XML-RPC <strong>request</strong> to another computer, which we will call the
server. Once the server receives and processes the request it will send
back a <strong>response</strong> to the client.</p>
<p>For example, using the MetaWeblog API, an XML-RPC Client (usually a
desktop publishing tool) will send a request to an XML-RPC Server
running on your site. This request might be a new weblog entry being
sent for publication, or it could be a request for an existing entry for
editing. When the XML-RPC Server receives this request it will examine
it to determine which class/method should be called to process the
request. Once processed, the server will then send back a response
message.</p>
<p>For detailed specifications, you can visit the <a class="reference external" href="http://www.xmlrpc.com/">XML-RPC</a> site.</p>
</div>
<div class="section" id="using-the-xml-rpc-class">
<h2><a class="toc-backref" href="#id4">Using the XML-RPC Class</a><a class="headerlink" href="#using-the-xml-rpc-class" title="Permalink to this headline">¶</a></h2>
<div class="section" id="initializing-the-class">
<h3><a class="toc-backref" href="#id5">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3>
<p>Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes
are initialized in your controller using the $this-&gt;load-&gt;library
function:</p>
<p>To load the XML-RPC class you will use:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Once loaded, the xml-rpc library object will be available using:
$this-&gt;xmlrpc</p>
<p>To load the XML-RPC Server class you will use:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Once loaded, the xml-rpcs library object will be available using:
$this-&gt;xmlrpcs</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">When using the XML-RPC Server class you must load BOTH the
XML-RPC class and the XML-RPC Server class.</p>
</div>
</div>
<div class="section" id="sending-xml-rpc-requests">
<h3><a class="toc-backref" href="#id6">Sending XML-RPC Requests</a><a class="headerlink" href="#sending-xml-rpc-requests" title="Permalink to this headline">¶</a></h3>
<p>To send a request to an XML-RPC server you must specify the following
information:</p>
<ul class="simple">
<li>The URL of the server</li>
<li>The method on the server you wish to call</li>
<li>The <em>request</em> data (explained below).</li>
</ul>
<p>Here is a basic example that sends a simple Weblogs.com ping to the
<a class="reference external" href="http://pingomatic.com/">Ping-o-Matic</a></p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://rpc.pingomatic.com/&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;weblogUpdates.ping&#39;</span><span class="p">);</span>

<span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;My Photoblog&#39;</span><span class="p">,</span> <span class="s1">&#39;http://www.my-site.com/photoblog/&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>

<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_request</span><span class="p">())</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="section" id="explanation">
<h4><a class="toc-backref" href="#id7">Explanation</a><a class="headerlink" href="#explanation" title="Permalink to this headline">¶</a></h4>
<p>The above code initializes the XML-RPC class, sets the server URL and
method to be called (weblogUpdates.ping). The request (in this case, the
title and URL of your site) is placed into an array for transportation,
and compiled using the request() function. Lastly, the full request is
sent. If the send_request() method returns false we will display the
error message sent back from the XML-RPC Server.</p>
</div>
</div>
<div class="section" id="anatomy-of-a-request">
<h3><a class="toc-backref" href="#id8">Anatomy of a Request</a><a class="headerlink" href="#anatomy-of-a-request" title="Permalink to this headline">¶</a></h3>
<p>An XML-RPC request is simply the data you are sending to the XML-RPC
server. Each piece of data in a request is referred to as a request
parameter. The above example has two parameters: The URL and title of
your site. When the XML-RPC server receives your request, it will look
for parameters it requires.</p>
<p>Request parameters must be placed into an array for transportation, and
each parameter can be one of seven data types (strings, numbers, dates,
etc.). If your parameters are something other than strings you will have
to include the data type in the request array.</p>
<p>Here is an example of a simple array with three parameters:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;www.some-site.com&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
</pre></div>
</div>
<p>If you use data types other than strings, or if you have several
different data types, you will place each parameter into its own array,
with the data type in the second position:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
        <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
        <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
        <span class="k">array</span><span class="p">(</span><span class="k">FALSE</span><span class="p">,</span> <span class="s1">&#39;boolean&#39;</span><span class="p">),</span>
        <span class="k">array</span><span class="p">(</span><span class="mi">12345</span><span class="p">,</span> <span class="s1">&#39;int&#39;</span><span class="p">)</span>
<span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
</pre></div>
</div>
<p>The <a class="reference external" href="#datatypes">Data Types</a> section below has a full list of data
types.</p>
</div>
<div class="section" id="creating-an-xml-rpc-server">
<h3><a class="toc-backref" href="#id9">Creating an XML-RPC Server</a><a class="headerlink" href="#creating-an-xml-rpc-server" title="Permalink to this headline">¶</a></h3>
<p>An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming
requests and redirecting them to the appropriate functions for
processing.</p>
<p>To create your own XML-RPC server involves initializing the XML-RPC
Server class in your controller where you expect the incoming request to
appear, then setting up an array with mapping instructions so that
incoming requests can be sent to the appropriate class and method for
processing.</p>
<p>Here is an example to illustrate:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>

<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;new_post&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;My_blog.new_entry&#39;</span><span class="p">);</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;update_post&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;My_blog.update_entry&#39;</span><span class="p">);</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;object&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="p">;</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">serve</span><span class="p">();</span>
</pre></div>
</div>
<p>The above example contains an array specifying two method requests that
the Server allows. The allowed methods are on the left side of the
array. When either of those are received, they will be mapped to the
class and method on the right.</p>
<p>The &#8216;object&#8217; key is a special key that you pass an instantiated class
object with, which is necessary when the method you are mapping to is
not part of the CodeIgniter super object.</p>
<p>In other words, if an XML-RPC Client sends a request for the new_post
method, your server will load the My_blog class and call the new_entry
function. If the request is for the update_post method, your server
will load the My_blog class and call the <tt class="docutils literal"><span class="pre">update_entry()</span></tt> method.</p>
<p>The function names in the above example are arbitrary. You&#8217;ll decide
what they should be called on your server, or if you are using
standardized APIs, like the Blogger or MetaWeblog API, you&#8217;ll use their
function names.</p>
<p>There are two additional configuration keys you may make use of when
initializing the server class: debug can be set to TRUE in order to
enable debugging, and xss_clean may be set to FALSE to prevent sending
data through the Security library&#8217;s <tt class="docutils literal"><span class="pre">xss_clean()</span></tt> method.</p>
</div>
<div class="section" id="processing-server-requests">
<h3><a class="toc-backref" href="#id10">Processing Server Requests</a><a class="headerlink" href="#processing-server-requests" title="Permalink to this headline">¶</a></h3>
<p>When the XML-RPC Server receives a request and loads the class/method
for processing, it will pass an object to that method containing the
data sent by the client.</p>
<p>Using the above example, if the new_post method is requested, the
server will expect a class to exist with this prototype:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">class</span> <span class="nc">My_blog</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>

        <span class="k">public</span> <span class="k">function</span> <span class="nf">new_post</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
        <span class="p">{</span>

        <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The $request variable is an object compiled by the Server, which
contains the data sent by the XML-RPC Client. Using this object you will
have access to the <em>request parameters</em> enabling you to process the
request. When you are done you will send a Response back to the Client.</p>
<p>Below is a real-world example, using the Blogger API. One of the methods
in the Blogger API is <tt class="docutils literal"><span class="pre">getUserInfo()</span></tt>. Using this method, an XML-RPC
Client can send the Server a username and password, in return the Server
sends back information about that particular user (nickname, user ID,
email address, etc.). Here is how the processing function might look:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">class</span> <span class="nc">My_blog</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>

        <span class="k">public</span> <span class="k">function</span> <span class="nf">getUserInfo</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
        <span class="p">{</span>
                <span class="nv">$username</span> <span class="o">=</span> <span class="s1">&#39;smitty&#39;</span><span class="p">;</span>
                <span class="nv">$password</span> <span class="o">=</span> <span class="s1">&#39;secretsmittypass&#39;</span><span class="p">;</span>

                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>

                <span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>

                <span class="k">if</span> <span class="p">(</span><span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">!=</span> <span class="nv">$username</span> <span class="o">&amp;&amp;</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o">!=</span> <span class="nv">$password</span><span class="p">)</span>
                <span class="p">{</span>
                        <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="s1">&#39;100&#39;</span><span class="p">,</span> <span class="s1">&#39;Invalid Access&#39;</span><span class="p">);</span>
                <span class="p">}</span>

                <span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
                        <span class="k">array</span><span class="p">(</span>
                                <span class="s1">&#39;nickname&#39;</span>  <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Smitty&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                                <span class="s1">&#39;userid&#39;</span>    <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;99&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                                <span class="s1">&#39;url&#39;</span>       <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;http://yoursite.com&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                                <span class="s1">&#39;email&#39;</span>     <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;jsmith@yoursite.com&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                                <span class="s1">&#39;lastname&#39;</span>  <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Smith&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                                <span class="s1">&#39;firstname&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">)</span>
                        <span class="p">),</span>
                         <span class="s1">&#39;struct&#39;</span>
                <span class="p">);</span>

                <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_response</span><span class="p">(</span><span class="nv">$response</span><span class="p">);</span>
        <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="section" id="notes">
<h4><a class="toc-backref" href="#id11">Notes:</a><a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h4>
<p>The <tt class="docutils literal"><span class="pre">output_parameters()</span></tt> method retrieves an indexed array
corresponding to the request parameters sent by the client. In the above
example, the output parameters will be the username and password.</p>
<p>If the username and password sent by the client were not valid, and
error message is returned using <tt class="docutils literal"><span class="pre">send_error_message()</span></tt>.</p>
<p>If the operation was successful, the client will be sent back a response
array containing the user&#8217;s info.</p>
</div>
</div>
<div class="section" id="formatting-a-response">
<h3><a class="toc-backref" href="#id12">Formatting a Response</a><a class="headerlink" href="#formatting-a-response" title="Permalink to this headline">¶</a></h3>
<p>Similar to <em>Requests</em>, <em>Responses</em> must be formatted as an array.
However, unlike requests, a response is an array <strong>that contains a
single item</strong>. This item can be an array with several additional arrays,
but there can be only one primary array index. In other words, the basic
prototype is this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Response data&#39;</span><span class="p">,</span> <span class="s1">&#39;array&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Responses, however, usually contain multiple pieces of information. In
order to accomplish this we must put the response into its own array so
that the primary array continues to contain a single piece of data.
Here&#8217;s an example showing how this might be accomplished:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
        <span class="k">array</span><span class="p">(</span>
                <span class="s1">&#39;first_name&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                <span class="s1">&#39;last_name&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
                <span class="s1">&#39;member_id&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="mi">123435</span><span class="p">,</span> <span class="s1">&#39;int&#39;</span><span class="p">),</span>
                <span class="s1">&#39;todo_list&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;clean house&#39;</span><span class="p">,</span> <span class="s1">&#39;call mom&#39;</span><span class="p">,</span> <span class="s1">&#39;water plants&#39;</span><span class="p">),</span> <span class="s1">&#39;array&#39;</span><span class="p">),</span>
        <span class="p">),</span>
        <span class="s1">&#39;struct&#39;</span>
<span class="p">);</span>
</pre></div>
</div>
<p>Notice that the above array is formatted as a struct. This is the most
common data type for responses.</p>
<p>As with Requests, a response can be one of the seven data types listed
in the <a class="reference external" href="#datatypes">Data Types</a> section.</p>
</div>
<div class="section" id="sending-an-error-response">
<h3><a class="toc-backref" href="#id13">Sending an Error Response</a><a class="headerlink" href="#sending-an-error-response" title="Permalink to this headline">¶</a></h3>
<p>If you need to send the client an error response you will use the
following:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="s1">&#39;123&#39;</span><span class="p">,</span> <span class="s1">&#39;Requested data not available&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The first parameter is the error number while the second parameter is
the error message.</p>
</div>
<div class="section" id="creating-your-own-client-and-server">
<h3><a class="toc-backref" href="#id14">Creating Your Own Client and Server</a><a class="headerlink" href="#creating-your-own-client-and-server" title="Permalink to this headline">¶</a></h3>
<p>To help you understand everything we&#8217;ve covered thus far, let&#8217;s create a
couple controllers that act as XML-RPC Client and Server. You&#8217;ll use the
Client to send a request to the Server and receive a response.</p>
<div class="section" id="the-client">
<h4><a class="toc-backref" href="#id15">The Client</a><a class="headerlink" href="#the-client" title="Permalink to this headline">¶</a></h4>
<p>Using a text editor, create a controller called Xmlrpc_client.php. In
it, place this code and save it to your application/controllers/
folder:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">class</span> <span class="nc">Xmlrpc_client</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>

        <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
        <span class="p">{</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
                <span class="nv">$server_url</span> <span class="o">=</span> <span class="nx">site_url</span><span class="p">(</span><span class="s1">&#39;xmlrpc_server&#39;</span><span class="p">);</span>

                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>

                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="nv">$server_url</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;Greetings&#39;</span><span class="p">);</span>

                <span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;How is it going?&#39;</span><span class="p">);</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>

                <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_request</span><span class="p">())</span>
                <span class="p">{</span>
                        <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
                <span class="p">}</span>
                <span class="k">else</span>
                <span class="p">{</span>
                        <span class="k">echo</span> <span class="s1">&#39;&lt;pre&gt;&#39;</span><span class="p">;</span>
                        <span class="nb">print_r</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_response</span><span class="p">());</span>
                        <span class="k">echo</span> <span class="s1">&#39;&lt;/pre&gt;&#39;</span><span class="p">;</span>
                <span class="p">}</span>
        <span class="p">}</span>
<span class="p">}</span>
<span class="cp">?&gt;</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">In the above code we are using a &#8220;url helper&#8221;. You can find more
information in the <a class="reference internal" href="../general/helpers.html"><em>Helpers Functions</em></a> page.</p>
</div>
</div>
<div class="section" id="the-server">
<h4><a class="toc-backref" href="#id16">The Server</a><a class="headerlink" href="#the-server" title="Permalink to this headline">¶</a></h4>
<p>Using a text editor, create a controller called Xmlrpc_server.php. In
it, place this code and save it to your application/controllers/
folder:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">class</span> <span class="nc">Xmlrpc_server</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>

        <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
        <span class="p">{</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>

                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;Greetings&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Xmlrpc_server.process&#39;</span><span class="p">);</span>

                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">serve</span><span class="p">();</span>
        <span class="p">}</span>


        <span class="k">public</span> <span class="k">function</span> <span class="nf">process</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
        <span class="p">{</span>
                <span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>

                <span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
                        <span class="k">array</span><span class="p">(</span>
                                <span class="s1">&#39;you_said&#39;</span>  <span class="o">=&gt;</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
                                <span class="s1">&#39;i_respond&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Not bad at all.&#39;</span>
                        <span class="p">),</span>
                        <span class="s1">&#39;struct&#39;</span>
                <span class="p">);</span>

                <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_response</span><span class="p">(</span><span class="nv">$response</span><span class="p">);</span>
        <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="try-it">
<h4><a class="toc-backref" href="#id17">Try it!</a><a class="headerlink" href="#try-it" title="Permalink to this headline">¶</a></h4>
<p>Now visit the your site using a URL similar to this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">xmlrpc_client</span><span class="o">/</span>
</pre></div>
</div>
<p>You should now see the message you sent to the server, and its response
back to you.</p>
<p>The client you created sends a message (&#8220;How&#8217;s is going?&#8221;) to the
server, along with a request for the &#8220;Greetings&#8221; method. The Server
receives the request and maps it to the <tt class="docutils literal"><span class="pre">process()</span></tt> method, where a
response is sent back.</p>
</div>
</div>
<div class="section" id="using-associative-arrays-in-a-request-parameter">
<h3><a class="toc-backref" href="#id18">Using Associative Arrays In a Request Parameter</a><a class="headerlink" href="#using-associative-arrays-in-a-request-parameter" title="Permalink to this headline">¶</a></h3>
<p>If you wish to use an associative array in your method parameters you
will need to use a struct datatype:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
        <span class="k">array</span><span class="p">(</span>
                <span class="c1">// Param 0</span>
                <span class="k">array</span><span class="p">(</span><span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;John&#39;</span><span class="p">),</span>
                <span class="s1">&#39;struct&#39;</span>
        <span class="p">),</span>
        <span class="k">array</span><span class="p">(</span>
                <span class="c1">// Param 1</span>
                <span class="k">array</span><span class="p">(</span>
                        <span class="s1">&#39;size&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;large&#39;</span><span class="p">,</span>
                        <span class="s1">&#39;shape&#39;</span><span class="o">=&gt;</span><span class="s1">&#39;round&#39;</span>
                <span class="p">),</span>
                <span class="s1">&#39;struct&#39;</span>
        <span class="p">)</span>
<span class="p">);</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
</pre></div>
</div>
<p>You can retrieve the associative array when processing the request in
the Server.</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>
<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="s1">&#39;name&#39;</span><span class="p">];</span>
<span class="nv">$size</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="s1">&#39;size&#39;</span><span class="p">];</span>
<span class="nv">$shape</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="s1">&#39;shape&#39;</span><span class="p">];</span>
</pre></div>
</div>
</div>
<div class="section" id="id2">
<h3><a class="toc-backref" href="#id19">Data Types</a><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
<p>According to the <a class="reference external" href="http://www.xmlrpc.com/spec">XML-RPC spec</a> there are
seven types of values that you can send via XML-RPC:</p>
<ul class="simple">
<li><em>int</em> or <em>i4</em></li>
<li><em>boolean</em></li>
<li><em>string</em></li>
<li><em>double</em></li>
<li><em>dateTime.iso8601</em></li>
<li><em>base64</em></li>
<li><em>struct</em> (contains array of values)</li>
<li><em>array</em> (contains array of values)</li>
</ul>
</div>
</div>
<div class="section" id="class-reference">
<h2><a class="toc-backref" href="#id20">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="CI_Xmlrpc">
<em class="property">class </em><tt class="descname">CI_Xmlrpc</tt><a class="headerlink" href="#CI_Xmlrpc" title="Permalink to this definition">¶</a></dt>
<dd><dl class="method">
<dt id="CI_Xmlrpc::initialize">
<tt class="descname">initialize</tt><big>(</big><span class="optional">[</span><em>$config = array()</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Xmlrpc::initialize" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$config</strong> (<em>array</em>) &#8211; Configuration data</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Initializes the XML-RPC library. Accepts an associative array containing your settings.</p>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::server">
<tt class="descname">server</tt><big>(</big><em>$url</em><span class="optional">[</span>, <em>$port = 80</em><span class="optional">[</span>, <em>$proxy = FALSE</em><span class="optional">[</span>, <em>$proxy_port = 8080</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Xmlrpc::server" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$url</strong> (<em>string</em>) &#8211; XML-RPC server URL</li>
<li><strong>$port</strong> (<em>int</em>) &#8211; Server port</li>
<li><strong>$proxy</strong> (<em>string</em>) &#8211; Optional proxy</li>
<li><strong>$proxy_port</strong> (<em>int</em>) &#8211; Proxy listening port</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Sets the URL and port number of the server to which a request is to be sent:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://www.sometimes.com/pings.php&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
</pre></div>
</div>
<p>Basic HTTP authentication is also supported, simply add it to the server URL:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://user:pass@localhost/&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::timeout">
<tt class="descname">timeout</tt><big>(</big><em>$seconds = 5</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::timeout" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$seconds</strong> (<em>int</em>) &#8211; Timeout in seconds</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Set a time out period (in seconds) after which the request will be canceled:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">timeout</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::method">
<tt class="descname">method</tt><big>(</big><em>$function</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::method" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$function</strong> (<em>string</em>) &#8211; Method name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Sets the method that will be requested from the XML-RPC server:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;method&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Where method is the name of the method.</p>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::request">
<tt class="descname">request</tt><big>(</big><em>$incoming</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::request" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$incoming</strong> (<em>array</em>) &#8211; Request data</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Takes an array of data and builds request to be sent to XML-RPC server:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;My Photoblog&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span> <span class="s1">&#39;http://www.yoursite.com/photoblog/&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::send_request">
<tt class="descname">send_request</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::send_request" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>The request sending method. Returns boolean TRUE or FALSE based on success for failure, enabling it to be used conditionally.</p>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::display_error">
<tt class="descname">display_error</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::display_error" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Error message string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns an error message as a string if your request failed for some reason.</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::display_response">
<tt class="descname">display_response</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::display_response" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Response</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
</tr>
</tbody>
</table>
<p>Returns the response from the remote server once request is received. The response will typically be an associative array.</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_response</span><span class="p">();</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Xmlrpc::send_error_message">
<tt class="descname">send_error_message</tt><big>(</big><em>$number</em>, <em>$message</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::send_error_message" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$number</strong> (<em>int</em>) &#8211; Error number</li>
<li><strong>$message</strong> (<em>string</em>) &#8211; Error message</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XML_RPC_Response instance</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">XML_RPC_Response</p>
</td>
</tr>
</tbody>
</table>
<p>This method lets you send an error message from your server to the client.
First parameter is the error number while the second parameter is the error message.</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="mi">123</span><span class="p">,</span> <span class="s1">&#39;Requested data not available&#39;</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

</dd></dl>

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